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Dietrich · OT

Strap for OT-5 Bronze

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll Dietrich
Lug width20 mm
Case diameter46 mm
ReferenceOTCAO5
FamilyOT
MovementMiyota caliber 82S7 Additional 24 hours Hand (fixed), small seconds, hours, minutes
Year2015
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

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Straps for the OT OTCAO5

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The OT OTCAO5, seen from the bench

The Dietrich OT-5 Bronze features an asymmetrical 46 mm stainless steel case with off-center dial at 3 o'clock and decentered crown. It houses a Miyota caliber 82S7 movement with hours, minutes, small seconds, and fixed 24-hour hand. The lug width is 20 mm, selected to maintain proportional harmony with the case diameter and ensure structural stability. Stainless steel construction provides durability and develops a silver patina over time.

Frequently asked questions

What is the lug width of the Dietrich OT OTCAO5?

The lug width of the OTCAO5 is 20 mm. This measurement is taken by placing a digital caliper between the side lugs of the case. It is essential to verify this dimension before purchasing an aftermarket strap to ensure precise fitting.

What is the best strap material for the Dietrich OTCAO5?

For the OTCAO5, we recommend alligator or vegetable-tanned calf leather, which enhance the asymmetrical case architecture through natural texture. Alternatively, a technical fabric NATO or butyl rubber solution offers sportive versatility whilst maintaining visual coherence with the watch's radical design.

How do I change the strap on my OTCAO5?

To change the strap, remove the watch from your wrist. Use a spring bar tool to gently push one of the side pins inward, releasing the strap from the first lug. Repeat on the other side. Insert the new strap by aligning the holes with the pins, then press until you hear the locking click.

Is the Dietrich OTCAO5 strap compatible with other 20mm watches?

Yes, 20mm straps are compatible with any watch featuring the same lug width. However, we recommend always verifying the exact measurement with a digital caliper before purchase, as minor tolerance variations could result in imprecise fitting.

What is the average lifespan of a leather strap for the OTCAO5?

A quality leather strap (alligator or calf) worn daily has an average lifespan of 3-5 years. Longevity depends on usage intensity, climate conditions, and maintenance. A rubber or NATO strap offers superior durability, often exceeding 5-7 years of intensive use.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only